Message:my 92 3.9 has just started playing up it wont start on the first turn of the key no matter how long you turn it but if you release it then try it ,it then starts any suggestions please many thanks. stew

Message:try this next time:
Turn key to ON-not START. Wait for a few seconds, you will hear fuel pump relay click. Then turn to start. I bet it fires right up.
Fuel pressure is bleeding off is what is causing the problem.